Apparatus for brushing, polishing, and the like



May 15, 19374, A. o. ENGBERG ET AL 1,958,658

APPARATUS FOR BRUSHING, POLISHING, AND THE LIKE Original Filed June 19, 1928 'H J M l I I? INVENTORS 2? MM gg gm:

23 fivkfif w Patented May 15, 1934 UNITED STATES APPARATUS FOR BRUSHING, POLISHING, AND THE LIKE Axel Olof Engberg andTord Erik Daniel Bilde,

Stockholm, Sweden, Patent Verwertungs,

assignors to Inventia Gesellschaft, Schaffhausen, Switzerland, a corporation of Switzerland Original application June 19, 1928, Serial No.

286,663. Divided and her 2, 1929, Serial No.

September 26, 1927 10 Claims.

This application is a division of our co-pending application Serial No. 286,663, filed June 19, 1928, and relates back to our co-pending application Serial No. 207,776, filed in the United States on July 22, 1927. Applications for patent based on the subject matter of this application were filed in Germany on November 27, 1926, Sweden on September 16, 1927, Denmark on November 11, 1927, Great Britain on November 24, 1927, France on November 26, 1927 and Switzerland on November 26, 1927, and this application is to be considered as relating back for common subject matter to the respective filing dates of the above identified applications.

The invention relates to apparatus for brushing, polishing or otherwise treating surfaces and more particularly to readily detachable attachments to be used in connection with motoroperated polishers.

One of the objects of the invention is the provision of a readily detachable, rotatable brush carrying disc, which permits not only thorough cleaning and repairing of the brushes, but also the use of different types of attachment members in connection with the same machine.

Our invention also relates to brush carrying discs having metal bristles. We provide soft bristles arranged in an annular ring within metal bristles in order to protect the fingers of theoperator against the sharp metal bristles when exchanging the discs.

These, as well as further objects, and the advantages of our invention will be apparent from the following description taken in connection with the accompanying drawing forming part of this specification and on which:

Fig. 1 is an elevational view, partially in crosssection, taken on line 11 of Fig. 2 of a carrier disc and brush carrying disc constructed in accordance with our invention;

Fig. 2 is a top view, partially in cross-section, of the device shown in Fig. 1;

Fig. 3 is a cross-sectional view, taken on line 3-3 of Fig. 2 of a portion of the device shown in Figs. 1 and 2;

Fig. 4 is an elevational view, partially in crosssection, of a preferred form of disc provided with metal bristles; and

Fig. 5 shows the manner of holding a metal brush carrying disc when exchanging the same.

Referring more particularly to Fig. 1, reference character 10 indicates a carrier disc which is intended to be rotatably mounted on a polisher of the type described in application Serial No. 286,663 and is rotated by a motor through the this application Decem- 410,950. In Germany agency of a belt passing partially around its circumferential face 11. Brush carrying disc 12 comprises a. member made of any suitable material in which are mounted, more or less around its circumference, in a well-known manner, brush bristles 13. Brush carrying disc 12 is provided.

with two or more pins 14 having double conical heads 15. Carrier disc 10 has formed therein openings 16 which correspond to the positioning of pins 14 and are of sufficient diameter so that the pins pass freely therethrough. Mounted on carrier disc 10 and around openings or holes 16 are flanged plates 17 which serve to retain springs 18. Springs 18 are formed near their central portions, which lie directly above openings 16, so that the springs approach each other at this point. The flanged plates 17 are formed with tongues 19 which are bent downwardly and backwardly through holes 20 in carrier disc 10, thus holding the plates in position. The central portion of disc 12 is provided with a cylindrical, downwardly extending hand grip or manipulat ing knob 21, which is preferably serrated.

When it is desired to place brush carrying disc 12 on carrier disc 10 the former is held by means of the hand grip 21 and the pins 15 are inserted through openings 16 in the carrier disc. The upper conical portion of heads 15 of the pins 14 force springs 18 apart until the region of greatest diameter of the pins has passed springs 18, whereupon the springs tend to return to their normal position and thus grip the lower conical portion of the heads 15. This holds brush carrying disc 12 securely against the bottom of carrier disc 10 and in a position for use, the two being held together by yieldingly engageable and yieldably severable members. To remove the brush carrying disc it is merely necessary to grasp hand grip 21 and pull the disc away from carrying disc 10, as the springs 18 spread out and release the conical heads 15 of pins 14 when suflicient pulling force is exerted.

Thus a readily attachable and removable brush carrying disc is provided which may be attached to a polishing machine without the use of nuts, thumbscrews, cotter pins, etc., or without having to be screwed thereon. The advantages of our improved device are at once apparent. There are no small detachable parts, such as nuts, etc., to become lost, no tools whatsoever are required to change discs and the changing of discs may be accomplished in much less time than is the case with the old means of attachment.

Such a readily attachable brush carrying disc is of particular value when the disc carries bristles made of sharp metallic material, careless contact with which would result injuriously to the operators hands.

A preferred embodiment of such a disc is shown in Fig. 4.

Mounted in disc 12, more or less around its circumference, are bristles 22 made of stiif metal wire or the like. Arranged in an annular ring within bristles 22 are protective brush bristles 23 also secured to disc 12. The purpose of protective bristles 23, which are ordinary soft bristles, is

. to prevent the operators fingers from coming in contact with the more or less sharp metallic bristles 22 when removing brush carrying disc 12, as is shown in Fig. 5. Disc 12 is provided with pins 14, as was the case in Figs. 1, 2 and 3, so that. it may be readily attached to a carrier disc, such as disc 10 in Fig. 3.

The combination of the readily attachable and removable disc with the protective bristles 23 render it virtually impossible for the operator to injure his hands while either placing the disc in position-on the carrier disc or removing it therefrom.

While we have shown a more or less specific embodiment of our invention for the purposes of description and illustration, it is to be understood that we. are to be limited only by the appended claims in view of the prior art.

Having thus described our invention, what we claim is:

1. A brush disc comprising a bristle retaining portion, stiff bristles in said portion, means for manually holding the disc, and soft-bristles between the holding means and the stiif bristles.

2. A brush disc comprising an annular bristle retaining disc portion; wire bristles projecting downwardly from said disc portion, engaging means on top of said disc portion, a downwardly extending hand grip disposed centrally of the disc comprising an annularcylindrical projection having a bulged outer edge and soft bristles between the hand grip and the wire bristles.

3. In a device of the class described, a carrier, a brush discand means. for releasably securing the brush disc to thecarrier comprising a plurality' of upwardly extending projections on the brush dischaving expanded portions, spring members mounted on the carrier having parts for engaging the sides of the projections under the'expanded portions, said parts of the spring members being spread apart by the expanded portions of the projections, and a downwardly extending manipulating knob on said disc for drawing the projections past the spring members to release the brush disc from the carrier.

4. In a device of the class described, a brush carrier, a brush disc and means for detachably securing the brush disc to the carrier and-releasing'the brush disc from the carrier comprising a plurality'of upwardly extending projections on thebrushgdisc having expanded portions; flat spring members comprising oppositely disposed parts pressed toward each other, means for mounting the spring members on the carrier, said carrier having openings through which the projections can'pass to be engaged by the spring members, said spring members being expandible by the projections and a downwardly extending annular hand grip in the center of the brush disc for drawinglthe projections through the spring members to release the brush disc from the-carrier.

5. In a device of. the class described, a brush carrier having holes formed therein, a brush disc and means for detachably securing the brush disc to the carrier and releasing the brush disc from the carrier comprising a plurality of upwardly extending projections on the brush disc having expanded portions, flat spring members comprising oppositely disposed parts pressed toward each other, means for mounting the spring members on the carrier comprising plate members having tongues projecting through the holes in the carrier, said carrier having openings through which the projections can pass to be engaged by the spring members, said spring members being expandible by the projections and a downwardly extending annular hand grip in the center of the brush disc for drawing the projections through the spring members to release the brush disc from the carrier.

6. In a device of the class described, a carrier, a disc comprising an annular bristle retaining portion, groups of wire bristles projecting downwardly from said disc portion, means for supporting said disc on said carrier comprising cooperating members yieldingly engageable and yieldably severable on drawing the disc away from the carrier, a hand grip on the central portion of the disc and groups of soft bristles disposed between the hand grip and the groups of Wire bristles.

7. In a device of the class described, a carrier, a disc comprising an annular bristle retaining portion, groups of wire bristles projecting downwardly from said disc portion, means for supporting said disc on said carrier comprising cooperating members yieldingly engageable and yieldably severable on drawing the disc away from the carrier, a downwardly extending hand grip disposed centrally of the disc comprising an annular cylindrical projection having a bulged outer edge and soft bristles disposed between the hand grip and the wire bristles.

. 8. In a device of the class described, a carrier, a brush disc and means yieldingly engageable and yieldably severable for securing said brush disc to said carrier, said means comprising projections on said brush disc having enlarged portlohs near their ends, spring members comprising oppositely disposed parts pressed toward each other, means for mounting said spring members on the carrier comprising plate members having tongues projecting through holes in the carrier, and a'downwardly extending manipulating knob on said disc for drawing the projections past the spring members to release the brush disc from the carrier.

9. In a device of the class described, a carrier, a brush disc and means yieldingly engageable and yieldably severable for securing said brush disc to said, carrier, said means comprising projections 'onisaid-brush disc having enlarged portions near their ends, said carrier having apertures through which said projections extend, spring members on said'carrier adjacent the apertures comprising oppositely disposed parts pressed toward each other, means for mounting the spring members onthe carrier. comprising plate membershaving tongues projecting through holes in the carrier,

and a downwardly extending manipulating knob on said disc for drawing the projections past the spring members to release the brush disc from the carrier.

:10. In a device of the class described, a carrier, a brush disc, means yieldingly engageable and yieldably severable for securing said brush:

disc to said carrier, said means comprising pro- Jections on said brush disc having enlarged porand said carrier and adapted to engage said projections, and a downwardly extending manipulating knob on said disc for drawing the projections past the spring members to release the brush disc from the carrier.

AXEL OLOF ENGBERG.

'I'ORD ERIK DANIEL BILDE. 

